//
//  BucketSort.cpp
//  排序技术
//
//  Created by 远平 on 2020/5/7.
//  Copyright © 2020 huangaengoln. All rights reserved.
//
/*
 代码来自：[简单掌握桶排序算法及C++版的代码实现](https://www.xp.cn/b.php/99097.html)
 */
#include <stdio.h>

#include<iterator>
#include<iostream>
#include<vector>
using namespace std;
const int BUCKET_NUM = 10;

struct ListNode{
    
    explicit ListNode(int i=0):mData(i),mNext(NULL){}
    ListNode* mNext;
    int mData;
};

ListNode* insert(ListNode* head,int val){
    
    ListNode dummyNode;
    ListNode *newNode = new ListNode(val);
    ListNode *pre,*curr;
    dummyNode.mNext = head;
    pre = &dummyNode;
    curr = head;
    while(NULL!=curr && curr->mData<=val){
        pre = curr;
        curr = curr->mNext;
    }
    newNode->mNext = curr;
    pre->mNext = newNode;
    return dummyNode.mNext;
}


ListNode* Merge(ListNode *head1,ListNode *head2){
    ListNode dummyNode;
    ListNode *dummy = &dummyNode;
    while(NULL!=head1 && NULL!=head2){
        if(head1->mData <= head2->mData){
            dummy->mNext = head1;
            head1 = head1->mNext;
        }else{
            dummy->mNext = head2;
            head2 = head2->mNext;
        }
        dummy = dummy->mNext;
    }
    if(NULL!=head1) dummy->mNext = head1;
    if(NULL!=head2) dummy->mNext = head2;
 
    return dummyNode.mNext;
}

void BucketSort(int n,int arr[]){
    vector<ListNode*> buckets(BUCKET_NUM,(ListNode*)(0));
    for(int i=0;i<n;++i){
        int index = arr[i]/BUCKET_NUM;
        ListNode *head = buckets.at(index);
        buckets.at(index) = insert(head,arr[i]);
    }
    ListNode *head = buckets.at(0);
    for(int i=1;i<BUCKET_NUM;++i){
        head = Merge(head,buckets.at(i));
    }
    for(int i=0;i<n;++i){
        arr[i] = head->mData;
        head = head->mNext;
    }
    
    for(int i=0;i<n;i++)
        cout<< arr[i] <<" ";
    cout<<"\n";
}
